PSLE Mary has a number of files in three colours: green, brown and orange.
310 of the files are green. The number of green files is twice the number of brown files. What fraction of the files is orange?
Green |
Brown |
Orange |
Total |
3x2 |
7x2 |
10x2 |
2x3 |
1x3 |
|
|
6 u |
3 u |
11 u |
20 u |
Number of green files is the repeated identity.
Make the number of green files the same.
LCM of 3 and 2 = 6
Number of orange files
= 20 u - 6 u - 3 u
= 11 u
Fraction of the files that is orange
=
1120 Answer(s):
1120